Hierarchy of operators
The Priority or Precedence of operator is the order in which the operators are to be evaluated, written in a expression is called the Hierarchy of operators.
The associativity specifies the operator's direction to be performed, it may be left-to-right or it may be right-to-left.
| Rank | Operator | Description | Associativity |
|---|---|---|---|
| ( ) | Parentheses | left-to-right | |
| ++ , -- | Pre-increment/pre-decrement | right-to-left | |
| sizeof | Determine size in bytes | right-to-left | |
| * , / , % | Multiplication, division, modulus | left-to-right | |
| + , - | Addition, subtraction | left-to-right | |
| < , > , <= , >= | Relational less than, less than or equals to, greater than, greater than or equals to | left-to-right | |
| == , != | Relational is equal to/is not equal to | left-to-right | |
| ++ , -- | Post-increment/post-decrement | right-to-left | |
| && | Logical AND | left-to-right | |
| || | Logical OR | left-to-right | |
| ?: | Ternary conditional | right-to-left | |
| = -= += >= <= | Assignment | right-to-left |
Example 1: Program to explain operator precedence.
#include<stdio.h>
void main()
{
float r;
r = 1.0 + 2.0 * 3.0 / 4.0;
printf("\n%f",r);
r = 1.0 / 2.0 + 3.0;
printf("\n%f",r);
r = (1.0 + 2.0) / 3.0;
printf("\n%f",r);
r = (1.0 + 2.0 / 3.0) + 4.0;
printf("\n%f",r);
}
2.500000
3.500000
1.000000
5.666667
3.500000
1.000000
5.666667
